[PATCH] walk PATH to generate list of commands for "help -a"

@@ -64,6 +64,19 @@ static int cmdname_compare(const void *a_, const void *b_)
 	return strcmp(a->name, b->name);
 }
 
+static void uniq(struct cmdname **cmdname)
+{
+	int i, j;
+
+	for (i = j = 1; i < cmdname_cnt; i++) {
+		if (strcmp(cmdname[i]->name, cmdname[i-1]->name)) {
+			cmdname[j++] = cmdname[i];
+		}
+	}
+
+	cmdname_cnt = j;
+}
+
 static void pretty_print_string_list(struct cmdname **cmdname, int longest)
 {
 	int cols = 1, rows;

@@ -71,12 +84,13 @@ static void pretty_print_string_list(struct cmdname **cmdname, int longest)
 	int max_cols = term_columns() - 1; /* don't print *on* the edge */
 	int i, j;
 
+	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
+	uniq(cmdname);
+
 	if (space < max_cols)
 		cols = max_cols / space;
 	rows = (cmdname_cnt + cols - 1) / cols;
 
-	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
-
 	for (i = 0; i < rows; i++) {
 		printf("  ");
 

@@ -93,19 +107,17 @@ static void pretty_print_string_list(struct cmdname **cmdname, int longest)
 	}
 }
 
-static void list_commands(const char *exec_path, const char *prefix)
+static unsigned int list_commands_in_dir(const char *dir, const char *prefix)
 {
 	unsigned int longest = 0;
 	int prefix_len = strlen(prefix);
-	DIR *dir = opendir(exec_path);
+	DIR *dirp = opendir(dir);
 	struct dirent *de;
 
-	if (!dir || chdir(exec_path)) {
-		fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
-		exit(1);
-	}
+	if (!dirp || chdir(dir))
+		return 0;
 
-	while ((de = readdir(dir)) != NULL) {
+	while ((de = readdir(dirp)) != NULL) {
 		struct stat st;
 		int entlen;
 

@@ -126,12 +138,37 @@ static void list_commands(const char *exec_path, const char *prefix)
 
 		add_cmdname(de->d_name + prefix_len, entlen);
 	}
-	closedir(dir);
+	closedir(dirp);
 
-	printf("git commands available in '%s'\n", exec_path);
-	printf("----------------------------");
-	mput_char('-', strlen(exec_path));
-	putchar('\n');
+	return longest;
+}
+
+static void list_commands(const char *prefix)
+{
+	unsigned int longest = 0;
+	unsigned int len;
+	const char *env_path = getenv("PATH");
+	char *paths, *path, *colon;
+
+	if (!env_path) {
+		fprintf(stderr, "PATH not set\n");
+		exit(1);
+	}
+
+	path = paths = xstrdup(env_path);
+	while ((char *)1 != path) {
+		if ((colon = strchr(path, ':')))
+			*colon = 0;
+
+		len = list_commands_in_dir(path, prefix);
+		longest = MAX(longest, len);
+
+		path = colon + 1;
+	}
+	free(paths);
+
+	printf("available git commands\n");
+	printf("----------------------\n");
 	pretty_print_string_list(cmdname, longest);
 	putchar('\n');
 }

@@ -188,7 +225,6 @@ int cmd_version(int argc, const char **argv, const char *prefix)
 int cmd_help(int argc, const char **argv, const char *prefix)
 {
 	const char *help_cmd = argc > 1 ? argv[1] : NULL;
-	const char *exec_path = git_exec_path();
 
 	if (!help_cmd) {
 		printf("usage: %s\n\n", git_usage_string);

@@ -198,8 +234,7 @@ int cmd_help(int argc, const char **argv, const char *prefix)
 
 	else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
 		printf("usage: %s\n\n", git_usage_string);
-		if(exec_path)
-			list_commands(exec_path, "git-");
+		list_commands("git-");
 		exit(0);
 	}